Title :
Robust image transmission over CDMA channels
Author :
Dang, Philip P. ; Chau, Paul M.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA
fDate :
8/1/2000 12:00:00 AM
Abstract :
The transmission of real-time images and video over wireless communication channels is a challenging problem. Digital compressed images are sensitive to bit errors which are typical in wireless communications. Moreover, the bandwidth at the air interface is currently a limiting factor because the first and second generation of mobile phone standards mainly support voice communications. We present a study of real-time image traffic over a radio link-the aim of this research is for videophone applications. We use the discrete wavelet transform (DWT) to compress images and a code division multiple access (CDMA) link to transfer images over wireless communications network. The experiment results indicate that it is possible to transfer 9-12 QCIF gray scale images per second over a CDMA link with graceful degradation in image quality
Keywords :
code division multiple access; data compression; discrete wavelet transforms; multiuser channels; radio links; telecommunication traffic; transform coding; video coding; videotelephony; CDMA channels; CDMA radio link; DWT; QCIF gray scale images; air interface bandwidth; bit errors; code division multiple access; digital compressed images; discrete wavelet transform; experimental results; image quality; mobile phone standards; real-time image traffic; real-time image transmission; robust image transmission; videophone applications; voice communications; wireless communication channels; wireless communications network; Bandwidth; Communication standards; Discrete wavelet transforms; Image coding; Image communication; Mobile handsets; Multiaccess communication; Robustness; Video compression; Wireless communication;
Journal_Title :
Consumer Electronics, IEEE Transactions on
